The Benchmark Assessment asked this:

Which of the following statements accurately uses the concepts of chemical and physical changes?

• A: Mixing different metals makes an alloy, which represents a physical change.
• B: Turning cement into concrete involves a chemical change for both cement and water.
• C: Smelting iron ore to produce iron is a chemical change.
• D: Wait a minute! All of these statements are accurate!

Defend your answer! Share your thought process!


The Following Answers Were Awarded Full Credit. Can you tell why?